Note 11 - Warrants (Detail) - Summary of Changes in Common Stock Warrant Liability (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 Benefit from Adjustment to Fair Value in 2010 (Member)	Dec. 31, 2011 Benefit from Adjustment to Fair Value in 2011 (Member)	Dec. 31, 2012 Loss from Adjustment to Fair Value in 2012 (Member)	Dec. 31, 2009 Beginning Balance (Member)
Balance	$ 4,283,932	$ 166,398	$ 248,131				$ 821,891
Benefit or Loss from Fair Value Adjustment	$ (4,117,534)	$ 81,733	$ 573,760	$ (573,760)	$ (81,733)	$ 4,117,534